I tried. It invalidated the cache of the block device after migration. So, here, we can use a new cache for the block device after migration. Is it right? I can implement a simple block driver in block/ directory.
On Mon, Jun 30, 2014 at 6:48 AM, Paolo Bonzini <pbonz...@redhat.com> wrote: > Il 28/06/2014 00:54, Xiongzi Ge ha scritto: > > Hi Paolo, >> >> Thanks. I found a function called bdrv_invalidate_cache() in qcow2.c. >> After migration, it will be called to invalidate the cache of the block >> device? >> > > Let me quote again: > > This function has *nothing* to do with the guest OS's >>> >>> cache. That cache is managed by the guest OS and, as I have already >>> told you multiple times, there is *nothing* that QEMU can do about >>> it. >>> >>> All you can do is use O_DIRECT in the guest. >>> >> > Did you even *try* to understand this?!? > > Paolo > >
